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MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) was incidentally administered to pregnant marmosets during the whole gestational period, except for the last 15 days before term. The infant monkeys were killed 5 months after birth, and dopamine and its metabolites were measured in the striatum and the nucleus accumbens.

Prenatal exposure to MPTP produced a marked dopamine depletion in these brain regions of the offspring, showing that MPTP is able to cross the placental barrier in primates.